<template>
    <div class="cmt-container">
    <h3>发表评论</h3>
    <hr>
    <textarea placeholder="请输入要BB的内容（做多吐槽120字）" maxlength="120" v-model="msg"></textarea>

    <mt-button type="primary" size="large" @click="postComment()">发表评论</mt-button>

    <div class="cmt-list">
      <div v-for="(item,i) in Comment" :key="i" class="cmt-item">
        <div class="cmt-title">
          第{{i+1}}楼&nbsp;&nbsp;用户：{{item.username}}&nbsp;&nbsp;发表时间：{{item.add_time | dateFormat}}
        </div>
        <div class="cmt-body">{{item.content}}</div>
      </div>

    </div>

    <mt-button type="danger" size="large" plain @click="getComment()">加载更多</mt-button>
  </div>
</template>
<script>
import { Toast } from 'mint-ui';
export default {
  data() {
    return {
      Comment:[],
      msg:""
    }
  },
  created() {
    // this.getComment()
    // localStorage.clear()

    this.Comment=JSON.parse(localStorage.getItem("cmt") || "[]");
  },
  // beforeUpdate(){
  // },
  methods: {
    getComment(){//用于获取本地数据
        this.$http.get("../../localdata/comment.json").then(result=>{
            if (result.body) {
                this.Comment=this.Comment.concat(result.body);
                // console.log(this.Comment)
            } else {
                Toast("加载评论失败！！！");
            }
        })
    },
    //发表评论
    postComment(){
      //从本地获取数据
      if (this.msg.trim()=="") {
        this.msg="";
        return Toast("请输入内容");
        
      }
      var newlist=JSON.parse(localStorage.getItem("cmt") || '[]');
      var obj={id:new Date(),add_time:new Date(),username:"",content:this.msg};
      newlist.unshift(obj);
      this.Comment=newlist;
      // console.log(newlist)
      // this.Comment=[...newlist,...this.Comment];
      localStorage.setItem("cmt",JSON.stringify(newlist));
      this.msg="";
    },
  },
}
</script>

<style lang="scss" scoped>
.cmt-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }

  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
      .cmt-title {
        line-height: 30px;
        background-color: #ccc;
      }
      .cmt-body {
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>